LVM Memory Usage

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http://www.unix.com – Hello I am using LVM to create volumes. After creating the volumes using "lvcreate" and then formating them as "ext3". I mounted these volumes to find around 40 -50GB space wasted. Any suggestions why? Code: # df -h Filesystem            Size  Used Avail Use% Mounted on /dev/sdb1            111G  16G  90G  15% / /dev/sda1              99M  24M  71M  25% /boot tmpfs                5.9G  & (HowTos)